Interchangeable anterior tooth.



P. V. HUMPHRIES.v

' INTERCHANGEABLE ANTERIQR mom.

APPLICATION FILED APR. 23. T91].

1,258,41 3 Patented Mar. 5, 1918 41 gHMMOZ FYHUMPHRIB s of the sidewalls 11 of the backing are provided integrally formed inwardlyextending flanges 15 arranged with their-inner edges in parallelrelation throughout their length I and adapted to be engaged in thegrooves l formed in the inclined sides of the base portion. 4

Owing to the inner, walls of the grooves being in spaced parallelrelation throughout their length and the construction of the inner edgesof the flanges formed on the side walls of the backingit will bereadily" seen that the tooth maybe applied tothe backing or the backingappliedto thetooth with out any resistance beingolfered by theengagement of the flanges with the grooves. These grooves andfiangeswhen engaged will serve to prevent any rocking or twisting of thetooth, thereby greatly'strengthening the construction of the same. Thegrooves. and socket are so arranged that a plane passing through thegrooves will intersect a portion of the curve of the socket 9 formed inthe base portion, and when the backing is applied, the lug 14 formed onthe backing will be engagedin the recess in a substantiallyhookedmanner, and owing to the arrangement of the grooves and the.

socket as hereinbefore described, any twisting or lateral strain uponthe tooth will be taken up and distributed evenly at all pointsthroughout the tooth and backing soas. not to bring undue stressupon'any portion of the tooth and thereby weaken the same.

The socket 9 is of sufficient size as to leave an equal thickness of thewalls at the front and rear of the tooth,and owing to this construction, it will be seen that no undue strain will be applied uponeither of the walls of the tooth as theyare'of the same thicknessthroughout.

In the mounting of my improved artificial tooth, gold. is burnished overthe end of the tooth root, which is cut as desired, and

pierced for pin reception, the tooth and backing are then placedtogether, the tooth being selected as to color and size, the backingwaxed in place, tooth removed and backing invested forsoldering,afterward, tooth is cemented into the backingand polishing"is'done as desired.) For bridge work, the manner of mounting is similarexcep t that, suitable abutinents are formedand the back ings mountedtherebetween. It will be readange 13 which is ily seen that thisconstruction entirely eliminates the necessity of the individual.dentist teeth are manufactured, and therefore all are manufactured and.

teeth will be interchangeable as the size of teeth are standardizedregardless. of the size or location of the tooth. I

'the backings and the base portions of the I do not confine myself tothe use of this backing for any special work such as crown work orbridge work, but I desire it to be understood that owingtoconstruction,1 the. backmg'niay be appl ed in bridge work orsuitablysupported on a pin inserted in i the root of a tooth for crown work, asdesired. I

In, the, accompanying drawing 7 I have illustrated iny i nprovedartificial tooth as i applied as an anterior tooth, but it is to beunderstood that the same construction may be applied to other variousforms of teeth. I desire it also to be understood that I do not limitmyself. specifically to the materials and details of constructionemployed in this embodiment of my invention, but:

that such may beusedas may fall within the scope of the appended claims.

' I wish it also understood that the flanges,

and grooves on the metallic backing and body of the. tooth respectivelymay be dispensed with if desired, and that the shape of the attachinglug may be varied, or that the attaching lug may be madecorrugated or ofplain surface as desired,the corrugated form being the preferredembodiment of my invention. I (312111112 1. An artificial tooth asdescribed having a reduced rear base portion, a beveledshoul der risingfrom the front edge of said base to the gingival' marginof the tooth,said base having a flat top at a substantially right angle to the stressof mastication, and

having convergent downwardly and out- 'wardly beveled side walls and asimilarly beveled rear wall, said basehaving an elongated socket thereinextendlng downwardly into the tooth and following the contour of thefront and rear walls of the tooth.

2; An artificial tooth as described having a reduced rear baseportion, abeveled shoul. der rising from the front edgeof said base to thegingival margm of said tooth, said base having a flat top substantiallyat right i angles :to the stressof mastication and having convergent.downwardlyland outwardly beveled sidewalls and. a similarly beveledrear Wall, mid-"1 ise 1510 ITHL Y IiI :1 7 '10 i vidhdlywith downwardlygntedsocket mcl'uiedslde wuliga fiat'top, wshbuldrmS I front, "saidtqpth 'h' the 1570111; 3114171 f i l lihafr'gmi gmovefirgxtfindipoy.havmg gmova I 1eslde wallsradlmcent 5111a (:knr'r'xsrngg' ifi m'n the;:L'z-(mtmlgc- (it 7 A, In; plane 01118 111' flat top, sand base 1&0 thegingiva lmse inning .rip'h't :mglu t0 b11195 7 b 1-1 ving cmlmi'geiut1min .nwm il. \mrdly bevelled side Willis uuil lmvclod rear wall said.him,v 150i awaken. t1] in i said b00111 mu 011? the 1 170111 hawkinglieu-1w (:15 [led s'ixilara foam flange my abut zigililll V e rlwsdtheltnmking m1; 3;, 1-1. ,3 Guomm, 4.. An zu'tifici-g I. 1 C; Dmqtmn,

f PAUL v. 'HUMPHRIES;

